Four equal point charges

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Four equal point charges, each of magnitude +Q, are to be placed in equilibrium at the corners of a square. What should be the magnitude and sign of the point charge that should be placed at the center of the square to do this job?
28
Oct
Four equal point charges, each of magnitude +Q, are to be placed in equilibrium at the corners of a square. What should be the magnitude and sign of the point charge that should be placed at the center of the square to do this job? are to be placed in equilibrium at the corners of [...]
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